<!DOCTYPE HTML>
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>下拉菜单</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
    <link rel="stylesheet" href="style.css">
    <link rel="stylesheet" href="07calculator.css">
</head>

<body>

    <div class="calculator">
        <h1>FreeCodeCamp Calculator</h1>
        <input type="textbox" class="textbox" readonly>
        <div class="buttons">
            <button class="button" value="AC">AC</button>
            <button class="button" value="CE">CE</button>
            <button class="button" value="%">%</button>
            <button class="button" value="/">/</button>
            <button class="button" value="7">7</button>
            <button class="button" value="8">8</button>
            <button class="button" value="9">9</button>
            <button class="button" value="*">*</button>
            <button class="button" value="4">4</button>
            <button class="button" value="5">5</button>
            <button class="button" value="6">6</button>
            <button class="button" value="-">-</button>
            <button class="button" value="1">1</button>
            <button class="button" value="2">2</button>
            <button class="button" value="3">3</button>
            <button class="button" value="+">+</button>
            <button class="button" value=".">.</button>
            <button class="button" value="0">0</button>
            <button class="button" value="And">Ans</button>
            <button class="button" value="=">=</button>
        </div>
    </div>
    <script src="js/jquery.min.js"></script>
    <script src="js/bootstrap.min.js"></script>
    <script src="07calculator.js"></script>
</body>

</html>